Basing the Pacific Fleet at San Diego changes Japan's target

What changes if the US Pacific Fleet remains based mainly at San Diego and uses Pearl Harbor only as a forward base?

The fleet would be beyond the planned strike's reach, but a less heavily defended Pearl Harbor might become a more plausible amphibious target.

A Pacific Fleet based mainly at San Diego would put Japan's preferred fleet targets beyond the practical reach of the Pearl Harbor striking force. With fewer ships and supporting forces concentrated on Oahu, however, Japanese planners might reconsider an amphibious assault on the islands. Moving the battle fleet east would therefore change the target as well as protect the ships. Basing choices can redirect an operation instead of preventing it outright.